December weather forecastHayama, Japan

December weather for Hayama, Japan: The first month of the winter, December, is still a cool month in Hayama, Japan, with an average temperature varying between 12.5°C (54.5°F) and 8.4°C (47.1°F). The months with the lowest UV index in Hayama, Japan, are January, February and December, with an average maximum UV index of 3.

Today

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Long-term

Year J F M A M J J A S O N December

December

Weather in December

The first month of the winter, December, is still a cool month in Hayama, Japan, with an average temperature varying between 12.5°C (54.5°F) and 8.4°C (47.1°F).

Temperature

Start of December brings a slight shift in the average high-temperature, dipping a bit from November's comfortable 17.1°C (62.8°F) to a fresh 12.5°C (54.5°F). The month of December in Hayama is marked by an average minimum temperature of 8.4°C (47.1°F), slightly cooler than its daytime counterpart.

Humidity

The average relative humidity in December in Hayama is 64%.

Rainfall

February and December are months with the least rain when the rain falls for 8.7 days and typically aggregates up to 39mm (1.54") of rain.

Snowfall

In Hayama, Japan, snow does not fall in April through December.

Sea temperature

In Hayama, in December, the average water temperature is 18.9°C (66°F).
Note: Swimming is not enjoyable for most people in water that is 18.9°C (66°F). As the temperature descends from 21°C (69.8°F) to 15°C (59°F), breathing control becomes harder.

Daylight

With an average of 9h and 48min of daylight, December has the shortest days of the year.
On the first day of December in Hayama, sunrise is at 06:31 and sunset at 16:29. On the last day of the month, sunrise is at 06:50 and sunset at 16:39 JST.

Sunshine

In Hayama, the average sunshine in December is 6.1h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 3 in December converts into the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In December, the average high-temperature and low-temperature in Hayama are 12.5°C (54.5°F) and 8.4°C (47.1°F) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is appraised at 34°C (93.2°F).

In December, the average relative humidity is 64%.

The months with the least rainfall are February and December Rain falls for 8.7 days and accumulates 39mm (1.54") of rain.

In Hayama, Japan, in December, during 8.7 rainfall days, 39mm (1.54") of precipitation is typically accumulated.

In Hayama, snow does not fall in April through December.

In Hayama, Japan, in December, it doesn't snow. In January, it regularly snows.

In Hayama, in December, the average water temperature is 18.9°C (66°F). For swimming, a surface water temperature of 18.9°C (66°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

December has the shortest days of the year in Hayama, Japan, with an average of 9h and 48min of daylight.

In December, the average day length in Hayama, Japan, is 9h and 50min.

In December, on the first day of the month, sunrise is at 06:31 and sunset at 16:29. On the last day of the month, in Hayama, Japan, sunrise is at 06:50 and sunset at 16:39 JST.

In Hayama, the average sunshine duration in December is 6.1h.

The months with the lowest UV index in Hayama, Japan, are January, February and December, with an average maximum UV index of 3.

In Hayama, Japan, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

17.1°C

12.5°C

9.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

19.3km/h

21.2km/h

20.9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

15.2

21.3

23.2

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Hayama, Japan

Average high temperature in December: 12.5°C

The warmest month (with the highest average high temperature) is August (28.8°C).
The month with the lowest average high temperature is January (9.8°C).

Average low temperature in December: 8.4°C

The month with the highest average low temperature is August (25.3°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).

Average pressure in December
Hayama, Japan

Average pressure in December: 1016.2mbar

The month with the highest atmospheric pressure is November (1017.9mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).

Average wind speed in December
Hayama, Japan

Average wind speed in December: 19.1km/h

The windiest month (with the highest average wind speed) is March (20.8km/h).
The calmest month (with the lowest average wind speed) is June (15.9km/h).

Average humidity in December
Hayama, Japan

Average humidity in December: 64%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is January (61%).

Average rainfall in December
Hayama, Japan

Average rainfall in December: 39mm

The wettest month (with the highest rainfall) is October (119mm).
The driest months (with the least rainfall) are February and December (39mm).

Average rainfall days in December
Hayama, Japan

Average rainfall days in December: 8.7 days

The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in December
Hayama, Japan

Average snowfall in December: 0mm

The month with the highest snowfall is February (10mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in December
Hayama, Japan

Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in December
Hayama, Japan

Average sea temperature in December: 18.9°C

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest months (with the lowest average sea temperature) are February and March (16.2°C).

Average daylight in December /
Average sunshine in December
Hayama, Japan

Average daylight in December: 9h and 48min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

Average sunshine in December: 6h and 6min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

Average sunshine days in December
Hayama, Japan

Average sunshine days in December: 21.3 days

The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is June (11.4 days).

Average UV index in December
Hayama, Japan

Average UV index in December: 3

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

Average cloud cover in December
Hayama, Japan

Average cloud cover in December: 31

The months with the most cloud cover are March, June and October (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in December
Hayama, Japan

Average visibility in December: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).